Stanley Supreme DF User Manual page 21

Hotplate burners
The burner heads and caps can be removed for cleaning.
Make sure they are absolutely dry before replacing.
When fitting the burner head, make sure it locates
properly within the bezel. Take care not to damage the
ignition electrode or the flame safety device probe.
Wok burner
Fish kettle burner
General
Check burner ports are not blocked. If blockage occurs,
remove stubborn particles using a piece of fuse wire.
Stubborn marks on the aluminium burner rings can be
removed using a proprietary cleaner such as Brasso.
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